[hibernate-issues] [Hibernate-JIRA] Commented: (HSEARCH-623) Support for faceting search results

[G Fernandes (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=39051#action_39051 ] 

G Fernandes commented on HSEARCH-623:
-------------------------------------

Right, this issue will be my next task then

> Support for faceting search results
> -----------------------------------
>
>                 Key: HSEARCH-623
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-623
>             Project: Hibernate Search
>          Issue Type: New Feature
>          Components: engine
>            Reporter: G Fernandes
>            Assignee: G Fernandes
>
> I've been asked more than once about the possibility to support facet retrieval from the search results. The idea is to categorize the results of a query into buckets containing a label plus a number of occurrences. Consider an example: I have a Book entity containing a language field. When I search for Books, I'd like to obtain not only a List<Book>, but also a list of languages and how many books from the search results fit into each of these languages, so that I can render the results as:
> Found 17 Books:
> English (10)
> Italian (5)
> Spanish (2)
> It'd be also possible to facet on more than a field at the same time, similar to what's being done with projections. 
> Facet calculation would be done at query time reading directly from the index, probably by using a plugable strategy, examples would be LuceneFieldCacheStrategy and TermEnumStrategy. 
> Asking for facets would be done at API level, probably with a decorator on top of QueryBuilder something like 
> facetQueryBuilder.facetOn("field1").facetOn("field2").results().facets(); 
> WDYT?

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